The information stored in a disk can be read many times without affecting the stored data. The presence of a magnetic spot represents one bit (1) and its absence represents zero bit (0). Information is recorded on tracks of a disk surface in the form of tiny magnetic spots. Each disk consists of a number of invisible concentric circles called tracks. Data are stored on both the surface of the disk. Database In-Memory doesnt change the behavior of how Oracle Database uses shared memory, or how it implements OS optimizations. It rotates with very high speed inside the disk drive. Also note that increasing the size of Oracle Database shared memory allocations can have operating system implications as well. Magnetic disks used in computer are made on the same principle. You might have seen the gramophone record, which is circular like a disk. It is an external storage unit that is located inside the system box. Assuming a base clock speed of 100Mhz, DDR RAM will provide 1600 MB/s of Bandwidth, DDR2 provides 3200 MB/s, and DDR3 provides 6400 MB/s. DDR2 RAM provides 4 data transfers per cycle, while DDR3 increases the number to 8. DDRSDRAM was capable of two data transfers per clock cycle, giving it twice the theoretical peak bandwidth of previous SDRAM (Synchronous Dynamic Random Access Memory or Synchronous DRAM is a type of memory that synchronizes itself with the computer’s system clock). The term “DDR” stands for Double Data Rate. Nowadays, DRAM comes in either DDR, DDR2 or DDR3 form. A single 30-pin SIMM can hold up to 4MB and a 72- pin SIMM can hold up to 32 MB of memory. Memory modules are either “Single Inline Memory Modules” SIMMs or “Dual In-Line Memory Modules” DIMMs. It consists of chips of memory, either in short chips (Dual In-line Pin (DIP) chips) or in memory modules. RAM is also referred to as Dynamic Random Access Memory (DRAM).
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